Question:medium

Which of the following haloalkanes react with aqueous KOH most rapidly by $S_N1$ reaction?

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For $S_N1$ reactions, tertiary halides react fastest due to the stability of the resulting carbocation.
Updated On: Feb 25, 2026
  • 2-Chlorobutane
  • 1-Bromobutane
  • 2-Bromo-2-Methylpropane
  • 2,2-Dimethyl-1-Chloropropane
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The Correct Option is C

Solution and Explanation

The $S_N1$ mechanism involves carbocation formation. Increased carbocation stability accelerates the reaction. 2-Bromo-2-Methylpropane's tertiary carbocation, stabilized by hyperconjugation and inductive effects, results in faster $S_N1$ reactions.
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